By Prince McLean

Despite begin a unique, key marketing feature of Snow Leopard, Apple has decided to open the code behind Grand Central Dispatch under the liberal Apache 2.0 license.

Snow Leopard's new Grand Central Dispatch feature, which serves as a system-wide mechanism for managing parallel task execution across multiple processor cores for developers, involves multiple components in the operating system. 

Read More: http://www.appleinsider.com/articles/09/09/11/apple_open_sources_snow_leopards_grand_central_dispatch.html